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Preparation method of fully biodegradable starch/polylactic acid base resin

A biodegradable resin, fully biological technology, applied in the field of preparation of phosphate modified starch, fully degradable starch/polylactic acid-based resin, can solve the problem of decreased mechanical properties of materials, poor mechanical properties of blends, limited starch addition, etc. problem, to achieve the effect of improving the coupling effect, improving the mechanical properties, and improving the dispersion

Inactive Publication Date: 2016-03-30
JIANGSU SUPLA BIOPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, native starch does not have thermoplasticity, and starch is hydrophilic, and it is difficult to be compatible with hydrophobic polylactic acid, so the starch-filled polylactic acid system is a thermodynamically incompatible system, and the simple blend of the two has poor mechanical properties.
For example, Chinese patent CN101157792A discloses a fully biodegradable polylactic acid composite material and its preparation method, but the mechanical properties of the material are greatly reduced, and the amount of starch added is also very limited, which greatly limits the application field of the material.
[0005] In order to improve the mechanical properties of materials, Chinese patent CN103131150A discloses a polypropylene / polylactic acid / starch composite material and its preparation method. These materials are very desirable from the perspective of weight reduction, and also have excellent mechanical properties. However, polypropylene is not biodegradable. When the starch is completely degraded, these traditional petroleum-based polymers still exist in the environment, causing pollution to the environment.
Then, Chinese patents CN102936400A and CN103147230A respectively announced a method of using biodegradable resin to toughen polylactic acid. Although it has good biodegradability and mechanical properties, the cost is high, and the amount of polylactic acid added is very limited, which is difficult to practice. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ① Mix 100 parts of polylactic acid (80000 by weight average, pre-dried to remove water), 70 parts of modified starch (after ultrasonic treatment, pre-dried to remove water), 15 parts of plasticizer, 1 part of antioxidant, 3 parts of compatibilizer, 0.5 part of chain extender, 3 parts of lubricant, 1 part of inorganic filler, mixed in a high-speed mixer at a temperature of 65°C, a speed of 3000r / min, and a mixing time of 30 minutes, and passed through a HAAKE rheometer after mixing fully Extrusion granulation, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, and the length-to-diameter ratio of the screw is 1:30;

[0028] ② Mix the pellets obtained in A with the biodegradable resin, extrude and granulate through the HAAKE rheometer, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, the length-to-diameter ratio of the screw is 1:30;

[0029] ③Dry the obtained pellets to remove moisture, and prepare test ...

Embodiment 2

[0031] ① 100 parts of polylactic acid (weight average molecular weight 80000, pre-dried to remove water), 60 parts of modified starch (after ultrasonic treatment, pre-dried to remove water), 15 parts of plasticizer, 1.5 parts of antioxidant, compatibilizer 4 parts, 1 part of chain extender, 2 parts of lubricant, 1 part of inorganic filler, mixed in a high-speed mixer at a temperature of 80°C, a speed of 3000r / min, and a mixing time of 30 minutes. After mixing fully, extrude through a HAAKE rheometer For granulation, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, and the length-to-diameter ratio of the screw is 1:30;

[0032] ② Mix the pellets obtained in A with the biodegradable resin, extrude and granulate through the HAAKE rheometer, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, the length-to-diameter ratio of the screw is 1:30;

[0033] ③Dry the obtained pellets to remove moisture, and prepare test ...

Embodiment 3

[0035]① 100 parts of polylactic acid (weight average molecular weight 120000, pre-dried to remove water), 60 parts of modified starch (after ultrasonic treatment, pre-dried to remove water), 15 parts of plasticizer, 2 parts of antioxidant, compatibilizer 5 parts, 1 part of chain extender, 3 parts of lubricant, 1 part of inorganic filler, mixed in a high-speed mixer at a temperature of 90°C, a speed of 4000r / min, and a mixing time of 50 minutes. After mixing fully, extrude through a HAAKE rheometer For granulation, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, and the length-to-diameter ratio of the screw is 1:30;

[0036] ② Mix the pellets obtained in A with the biodegradable resin, extrude and granulate through the HAAKE rheometer, the temperature range of the extruder is 140-220°C, the screw speed is 40-140r / min, the length-to-diameter ratio of the screw is 1:30;

[0037] ③Dry the obtained pellets to remove moisture, and prepare test sp...

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Abstract

The invention provides a preparation method of fully biodegradable starch / polylactic acid base resin. The starch / polylactic acid base resin comprises 100 parts of polylactic acid, 30-90 parts of modified starch, 5-25 parts of biodegradable resin, 15-35 parts of a plasticizer and 1-15 parts of other assistants. The preparation method comprises the following steps: carrying out ultrasonic treatment on the modified starch, mixing the ultrasonic treated modified starch, polylactic acid powder and the other assistants in a high speed mixer at a temperature equal to or greater than the glass transition temperature of polylactic acid, and carrying out blending granulation on the above obtained blend through a double screw extruder to obtain a completely biodegradable material with excellent mechanical strength. Compared with like resins, the resin provided by the invention has the advantages of realization of reduction of the cost of the polylactic acid material while realizing high starch loading, good mechanical performances, full biodegradability and improved practicality.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for preparing fully biodegradable starch / polylactic acid-based resin, in particular to phosphate modified starch, which is blended with polylactic acid and biodegradable resin to prepare high starch content Preparation of fully degradable starch / polylactic acid-based resin with low cost and excellent mechanical properties. Background technique [0002] Petroleum resources are a non-renewable resource. With the large demand for oil in modern industry, there is no doubt that oil has become the most precious resource in the world. For the plastics industry, the development and utilization of petroleum resources has undoubtedly greatly promoted the development of the industry. However, there is a difficult problem in traditional petroleum-based plastics, that is, it is difficult to dispose of waste plastics. The traditional method is to bury or incinera...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L3/06C08L3/04C08L67/02C08K13/02
Inventor 王庭华宋亚男林育锋张简邦宏吴中仁
Owner JIANGSU SUPLA BIOPLASTICS CO LTD
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